Commit | Line | Data |
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4ede028f HCE |
1 | /* |
2 | * Driver for the Atmel AC97C controller | |
3 | * | |
4 | * Copyright (C) 2005-2009 Atmel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published by | |
8 | * the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/clk.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/bitmap.h> | |
13 | #include <linux/dmaengine.h> | |
14 | #include <linux/dma-mapping.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/gpio.h> | |
21 | #include <linux/io.h> | |
22 | ||
23 | #include <sound/core.h> | |
24 | #include <sound/initval.h> | |
25 | #include <sound/pcm.h> | |
26 | #include <sound/pcm_params.h> | |
27 | #include <sound/ac97_codec.h> | |
28 | #include <sound/atmel-ac97c.h> | |
29 | #include <sound/memalloc.h> | |
30 | ||
31 | #include <linux/dw_dmac.h> | |
32 | ||
33 | #include "ac97c.h" | |
34 | ||
35 | enum { | |
36 | DMA_TX_READY = 0, | |
37 | DMA_RX_READY, | |
38 | DMA_TX_CHAN_PRESENT, | |
39 | DMA_RX_CHAN_PRESENT, | |
40 | }; | |
41 | ||
42 | /* Serialize access to opened variable */ | |
43 | static DEFINE_MUTEX(opened_mutex); | |
44 | ||
45 | struct atmel_ac97c_dma { | |
46 | struct dma_chan *rx_chan; | |
47 | struct dma_chan *tx_chan; | |
48 | }; | |
49 | ||
50 | struct atmel_ac97c { | |
51 | struct clk *pclk; | |
52 | struct platform_device *pdev; | |
53 | struct atmel_ac97c_dma dma; | |
54 | ||
55 | struct snd_pcm_substream *playback_substream; | |
56 | struct snd_pcm_substream *capture_substream; | |
57 | struct snd_card *card; | |
58 | struct snd_pcm *pcm; | |
59 | struct snd_ac97 *ac97; | |
60 | struct snd_ac97_bus *ac97_bus; | |
61 | ||
62 | u64 cur_format; | |
63 | unsigned int cur_rate; | |
64 | unsigned long flags; | |
65 | /* Serialize access to opened variable */ | |
66 | spinlock_t lock; | |
67 | void __iomem *regs; | |
68 | int opened; | |
69 | int reset_pin; | |
70 | }; | |
71 | ||
72 | #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data) | |
73 | ||
74 | #define ac97c_writel(chip, reg, val) \ | |
75 | __raw_writel((val), (chip)->regs + AC97C_##reg) | |
76 | #define ac97c_readl(chip, reg) \ | |
77 | __raw_readl((chip)->regs + AC97C_##reg) | |
78 | ||
79 | /* This function is called by the DMA driver. */ | |
80 | static void atmel_ac97c_dma_playback_period_done(void *arg) | |
81 | { | |
82 | struct atmel_ac97c *chip = arg; | |
83 | snd_pcm_period_elapsed(chip->playback_substream); | |
84 | } | |
85 | ||
86 | static void atmel_ac97c_dma_capture_period_done(void *arg) | |
87 | { | |
88 | struct atmel_ac97c *chip = arg; | |
89 | snd_pcm_period_elapsed(chip->capture_substream); | |
90 | } | |
91 | ||
92 | static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip, | |
93 | struct snd_pcm_substream *substream, | |
94 | enum dma_data_direction direction) | |
95 | { | |
96 | struct dma_chan *chan; | |
97 | struct dw_cyclic_desc *cdesc; | |
98 | struct snd_pcm_runtime *runtime = substream->runtime; | |
99 | unsigned long buffer_len, period_len; | |
100 | ||
101 | /* | |
102 | * We don't do DMA on "complex" transfers, i.e. with | |
103 | * non-halfword-aligned buffers or lengths. | |
104 | */ | |
105 | if (runtime->dma_addr & 1 || runtime->buffer_size & 1) { | |
106 | dev_dbg(&chip->pdev->dev, "too complex transfer\n"); | |
107 | return -EINVAL; | |
108 | } | |
109 | ||
110 | if (direction == DMA_TO_DEVICE) | |
111 | chan = chip->dma.tx_chan; | |
112 | else | |
113 | chan = chip->dma.rx_chan; | |
114 | ||
115 | buffer_len = frames_to_bytes(runtime, runtime->buffer_size); | |
116 | period_len = frames_to_bytes(runtime, runtime->period_size); | |
117 | ||
118 | cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len, | |
119 | period_len, direction); | |
120 | if (IS_ERR(cdesc)) { | |
121 | dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n"); | |
122 | return PTR_ERR(cdesc); | |
123 | } | |
124 | ||
125 | if (direction == DMA_TO_DEVICE) { | |
126 | cdesc->period_callback = atmel_ac97c_dma_playback_period_done; | |
127 | set_bit(DMA_TX_READY, &chip->flags); | |
128 | } else { | |
129 | cdesc->period_callback = atmel_ac97c_dma_capture_period_done; | |
130 | set_bit(DMA_RX_READY, &chip->flags); | |
131 | } | |
132 | ||
133 | cdesc->period_callback_param = chip; | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static struct snd_pcm_hardware atmel_ac97c_hw = { | |
139 | .info = (SNDRV_PCM_INFO_MMAP | |
140 | | SNDRV_PCM_INFO_MMAP_VALID | |
141 | | SNDRV_PCM_INFO_INTERLEAVED | |
142 | | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
143 | | SNDRV_PCM_INFO_JOINT_DUPLEX | |
144 | | SNDRV_PCM_INFO_RESUME | |
145 | | SNDRV_PCM_INFO_PAUSE), | |
146 | .formats = (SNDRV_PCM_FMTBIT_S16_BE | |
147 | | SNDRV_PCM_FMTBIT_S16_LE), | |
148 | .rates = (SNDRV_PCM_RATE_CONTINUOUS), | |
149 | .rate_min = 4000, | |
150 | .rate_max = 48000, | |
151 | .channels_min = 1, | |
152 | .channels_max = 2, | |
153 | .buffer_bytes_max = 64 * 4096, | |
154 | .period_bytes_min = 4096, | |
155 | .period_bytes_max = 4096, | |
156 | .periods_min = 4, | |
157 | .periods_max = 64, | |
158 | }; | |
159 | ||
160 | static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream) | |
161 | { | |
162 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
163 | struct snd_pcm_runtime *runtime = substream->runtime; | |
164 | ||
165 | mutex_lock(&opened_mutex); | |
166 | chip->opened++; | |
167 | runtime->hw = atmel_ac97c_hw; | |
168 | if (chip->cur_rate) { | |
169 | runtime->hw.rate_min = chip->cur_rate; | |
170 | runtime->hw.rate_max = chip->cur_rate; | |
171 | } | |
172 | if (chip->cur_format) | |
173 | runtime->hw.formats = (1ULL << chip->cur_format); | |
174 | mutex_unlock(&opened_mutex); | |
175 | chip->playback_substream = substream; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream) | |
180 | { | |
181 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
182 | struct snd_pcm_runtime *runtime = substream->runtime; | |
183 | ||
184 | mutex_lock(&opened_mutex); | |
185 | chip->opened++; | |
186 | runtime->hw = atmel_ac97c_hw; | |
187 | if (chip->cur_rate) { | |
188 | runtime->hw.rate_min = chip->cur_rate; | |
189 | runtime->hw.rate_max = chip->cur_rate; | |
190 | } | |
191 | if (chip->cur_format) | |
192 | runtime->hw.formats = (1ULL << chip->cur_format); | |
193 | mutex_unlock(&opened_mutex); | |
194 | chip->capture_substream = substream; | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream) | |
199 | { | |
200 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
201 | ||
202 | mutex_lock(&opened_mutex); | |
203 | chip->opened--; | |
204 | if (!chip->opened) { | |
205 | chip->cur_rate = 0; | |
206 | chip->cur_format = 0; | |
207 | } | |
208 | mutex_unlock(&opened_mutex); | |
209 | ||
210 | chip->playback_substream = NULL; | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream) | |
216 | { | |
217 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
218 | ||
219 | mutex_lock(&opened_mutex); | |
220 | chip->opened--; | |
221 | if (!chip->opened) { | |
222 | chip->cur_rate = 0; | |
223 | chip->cur_format = 0; | |
224 | } | |
225 | mutex_unlock(&opened_mutex); | |
226 | ||
227 | chip->capture_substream = NULL; | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream, | |
233 | struct snd_pcm_hw_params *hw_params) | |
234 | { | |
235 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
236 | int retval; | |
237 | ||
238 | retval = snd_pcm_lib_malloc_pages(substream, | |
239 | params_buffer_bytes(hw_params)); | |
240 | if (retval < 0) | |
241 | return retval; | |
242 | /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ | |
243 | if (retval == 1) | |
244 | if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) | |
245 | dw_dma_cyclic_free(chip->dma.tx_chan); | |
246 | ||
247 | /* Set restrictions to params. */ | |
248 | mutex_lock(&opened_mutex); | |
249 | chip->cur_rate = params_rate(hw_params); | |
250 | chip->cur_format = params_format(hw_params); | |
251 | mutex_unlock(&opened_mutex); | |
252 | ||
253 | return retval; | |
254 | } | |
255 | ||
256 | static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream, | |
257 | struct snd_pcm_hw_params *hw_params) | |
258 | { | |
259 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
260 | int retval; | |
261 | ||
262 | retval = snd_pcm_lib_malloc_pages(substream, | |
263 | params_buffer_bytes(hw_params)); | |
264 | if (retval < 0) | |
265 | return retval; | |
266 | /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */ | |
267 | if (retval == 1) | |
268 | if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) | |
269 | dw_dma_cyclic_free(chip->dma.rx_chan); | |
270 | ||
271 | /* Set restrictions to params. */ | |
272 | mutex_lock(&opened_mutex); | |
273 | chip->cur_rate = params_rate(hw_params); | |
274 | chip->cur_format = params_format(hw_params); | |
275 | mutex_unlock(&opened_mutex); | |
276 | ||
277 | return retval; | |
278 | } | |
279 | ||
280 | static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream) | |
281 | { | |
282 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
283 | if (test_and_clear_bit(DMA_TX_READY, &chip->flags)) | |
284 | dw_dma_cyclic_free(chip->dma.tx_chan); | |
285 | return snd_pcm_lib_free_pages(substream); | |
286 | } | |
287 | ||
288 | static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream) | |
289 | { | |
290 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
291 | if (test_and_clear_bit(DMA_RX_READY, &chip->flags)) | |
292 | dw_dma_cyclic_free(chip->dma.rx_chan); | |
293 | return snd_pcm_lib_free_pages(substream); | |
294 | } | |
295 | ||
296 | static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream) | |
297 | { | |
298 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
299 | struct snd_pcm_runtime *runtime = substream->runtime; | |
300 | unsigned long word = 0; | |
301 | int retval; | |
302 | ||
303 | /* assign channels to AC97C channel A */ | |
304 | switch (runtime->channels) { | |
305 | case 1: | |
306 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A); | |
307 | break; | |
308 | case 2: | |
309 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | |
310 | | AC97C_CH_ASSIGN(PCM_RIGHT, A); | |
311 | break; | |
312 | default: | |
313 | /* TODO: support more than two channels */ | |
314 | return -EINVAL; | |
315 | break; | |
316 | } | |
317 | ac97c_writel(chip, OCA, word); | |
318 | ||
319 | /* configure sample format and size */ | |
320 | word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; | |
321 | ||
322 | switch (runtime->format) { | |
323 | case SNDRV_PCM_FORMAT_S16_LE: | |
324 | word |= AC97C_CMR_CEM_LITTLE; | |
325 | break; | |
326 | case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ | |
327 | default: | |
328 | word &= ~(AC97C_CMR_CEM_LITTLE); | |
329 | break; | |
330 | } | |
331 | ||
332 | ac97c_writel(chip, CAMR, word); | |
333 | ||
334 | /* set variable rate if needed */ | |
335 | if (runtime->rate != 48000) { | |
336 | word = ac97c_readl(chip, MR); | |
337 | word |= AC97C_MR_VRA; | |
338 | ac97c_writel(chip, MR, word); | |
339 | } else { | |
340 | word = ac97c_readl(chip, MR); | |
341 | word &= ~(AC97C_MR_VRA); | |
342 | ac97c_writel(chip, MR, word); | |
343 | } | |
344 | ||
345 | retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, | |
346 | runtime->rate); | |
347 | if (retval) | |
348 | dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", | |
349 | runtime->rate); | |
350 | ||
351 | if (!test_bit(DMA_TX_READY, &chip->flags)) | |
352 | retval = atmel_ac97c_prepare_dma(chip, substream, | |
353 | DMA_TO_DEVICE); | |
354 | ||
355 | return retval; | |
356 | } | |
357 | ||
358 | static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream) | |
359 | { | |
360 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
361 | struct snd_pcm_runtime *runtime = substream->runtime; | |
362 | unsigned long word = 0; | |
363 | int retval; | |
364 | ||
365 | /* assign channels to AC97C channel A */ | |
366 | switch (runtime->channels) { | |
367 | case 1: | |
368 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A); | |
369 | break; | |
370 | case 2: | |
371 | word |= AC97C_CH_ASSIGN(PCM_LEFT, A) | |
372 | | AC97C_CH_ASSIGN(PCM_RIGHT, A); | |
373 | break; | |
374 | default: | |
375 | /* TODO: support more than two channels */ | |
376 | return -EINVAL; | |
377 | break; | |
378 | } | |
379 | ac97c_writel(chip, ICA, word); | |
380 | ||
381 | /* configure sample format and size */ | |
382 | word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16; | |
383 | ||
384 | switch (runtime->format) { | |
385 | case SNDRV_PCM_FORMAT_S16_LE: | |
386 | word |= AC97C_CMR_CEM_LITTLE; | |
387 | break; | |
388 | case SNDRV_PCM_FORMAT_S16_BE: /* fall through */ | |
389 | default: | |
390 | word &= ~(AC97C_CMR_CEM_LITTLE); | |
391 | break; | |
392 | } | |
393 | ||
394 | ac97c_writel(chip, CAMR, word); | |
395 | ||
396 | /* set variable rate if needed */ | |
397 | if (runtime->rate != 48000) { | |
398 | word = ac97c_readl(chip, MR); | |
399 | word |= AC97C_MR_VRA; | |
400 | ac97c_writel(chip, MR, word); | |
401 | } else { | |
402 | word = ac97c_readl(chip, MR); | |
403 | word &= ~(AC97C_MR_VRA); | |
404 | ac97c_writel(chip, MR, word); | |
405 | } | |
406 | ||
407 | retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, | |
408 | runtime->rate); | |
409 | if (retval) | |
410 | dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n", | |
411 | runtime->rate); | |
412 | ||
413 | if (!test_bit(DMA_RX_READY, &chip->flags)) | |
414 | retval = atmel_ac97c_prepare_dma(chip, substream, | |
415 | DMA_FROM_DEVICE); | |
416 | ||
417 | return retval; | |
418 | } | |
419 | ||
420 | static int | |
421 | atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd) | |
422 | { | |
423 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
424 | unsigned long camr; | |
425 | int retval = 0; | |
426 | ||
427 | camr = ac97c_readl(chip, CAMR); | |
428 | ||
429 | switch (cmd) { | |
430 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ | |
431 | case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ | |
432 | case SNDRV_PCM_TRIGGER_START: | |
433 | retval = dw_dma_cyclic_start(chip->dma.tx_chan); | |
434 | if (retval) | |
435 | goto out; | |
436 | camr |= AC97C_CMR_CENA; | |
437 | break; | |
438 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ | |
439 | case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ | |
440 | case SNDRV_PCM_TRIGGER_STOP: | |
441 | dw_dma_cyclic_stop(chip->dma.tx_chan); | |
442 | if (chip->opened <= 1) | |
443 | camr &= ~AC97C_CMR_CENA; | |
444 | break; | |
445 | default: | |
446 | retval = -EINVAL; | |
447 | goto out; | |
448 | } | |
449 | ||
450 | ac97c_writel(chip, CAMR, camr); | |
451 | out: | |
452 | return retval; | |
453 | } | |
454 | ||
455 | static int | |
456 | atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd) | |
457 | { | |
458 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
459 | unsigned long camr; | |
460 | int retval = 0; | |
461 | ||
462 | camr = ac97c_readl(chip, CAMR); | |
463 | ||
464 | switch (cmd) { | |
465 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ | |
466 | case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ | |
467 | case SNDRV_PCM_TRIGGER_START: | |
468 | retval = dw_dma_cyclic_start(chip->dma.rx_chan); | |
469 | if (retval) | |
470 | goto out; | |
471 | camr |= AC97C_CMR_CENA; | |
472 | break; | |
473 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ | |
474 | case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ | |
475 | case SNDRV_PCM_TRIGGER_STOP: | |
476 | dw_dma_cyclic_stop(chip->dma.rx_chan); | |
477 | if (chip->opened <= 1) | |
478 | camr &= ~AC97C_CMR_CENA; | |
479 | break; | |
480 | default: | |
481 | retval = -EINVAL; | |
482 | break; | |
483 | } | |
484 | ||
485 | ac97c_writel(chip, CAMR, camr); | |
486 | out: | |
487 | return retval; | |
488 | } | |
489 | ||
490 | static snd_pcm_uframes_t | |
491 | atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream) | |
492 | { | |
493 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
494 | struct snd_pcm_runtime *runtime = substream->runtime; | |
495 | snd_pcm_uframes_t frames; | |
496 | unsigned long bytes; | |
497 | ||
498 | bytes = dw_dma_get_src_addr(chip->dma.tx_chan); | |
499 | bytes -= runtime->dma_addr; | |
500 | ||
501 | frames = bytes_to_frames(runtime, bytes); | |
502 | if (frames >= runtime->buffer_size) | |
503 | frames -= runtime->buffer_size; | |
504 | return frames; | |
505 | } | |
506 | ||
507 | static snd_pcm_uframes_t | |
508 | atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream) | |
509 | { | |
510 | struct atmel_ac97c *chip = snd_pcm_substream_chip(substream); | |
511 | struct snd_pcm_runtime *runtime = substream->runtime; | |
512 | snd_pcm_uframes_t frames; | |
513 | unsigned long bytes; | |
514 | ||
515 | bytes = dw_dma_get_dst_addr(chip->dma.rx_chan); | |
516 | bytes -= runtime->dma_addr; | |
517 | ||
518 | frames = bytes_to_frames(runtime, bytes); | |
519 | if (frames >= runtime->buffer_size) | |
520 | frames -= runtime->buffer_size; | |
521 | return frames; | |
522 | } | |
523 | ||
524 | static struct snd_pcm_ops atmel_ac97_playback_ops = { | |
525 | .open = atmel_ac97c_playback_open, | |
526 | .close = atmel_ac97c_playback_close, | |
527 | .ioctl = snd_pcm_lib_ioctl, | |
528 | .hw_params = atmel_ac97c_playback_hw_params, | |
529 | .hw_free = atmel_ac97c_playback_hw_free, | |
530 | .prepare = atmel_ac97c_playback_prepare, | |
531 | .trigger = atmel_ac97c_playback_trigger, | |
532 | .pointer = atmel_ac97c_playback_pointer, | |
533 | }; | |
534 | ||
535 | static struct snd_pcm_ops atmel_ac97_capture_ops = { | |
536 | .open = atmel_ac97c_capture_open, | |
537 | .close = atmel_ac97c_capture_close, | |
538 | .ioctl = snd_pcm_lib_ioctl, | |
539 | .hw_params = atmel_ac97c_capture_hw_params, | |
540 | .hw_free = atmel_ac97c_capture_hw_free, | |
541 | .prepare = atmel_ac97c_capture_prepare, | |
542 | .trigger = atmel_ac97c_capture_trigger, | |
543 | .pointer = atmel_ac97c_capture_pointer, | |
544 | }; | |
545 | ||
546 | static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip) | |
547 | { | |
548 | struct snd_pcm *pcm; | |
549 | struct snd_pcm_hardware hw = atmel_ac97c_hw; | |
550 | int capture, playback, retval; | |
551 | ||
552 | capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
553 | playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
554 | ||
555 | retval = snd_pcm_new(chip->card, chip->card->shortname, | |
556 | chip->pdev->id, playback, capture, &pcm); | |
557 | if (retval) | |
558 | return retval; | |
559 | ||
560 | if (capture) | |
561 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, | |
562 | &atmel_ac97_capture_ops); | |
563 | if (playback) | |
564 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, | |
565 | &atmel_ac97_playback_ops); | |
566 | ||
567 | retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
568 | &chip->pdev->dev, hw.periods_min * hw.period_bytes_min, | |
569 | hw.buffer_bytes_max); | |
570 | if (retval) | |
571 | return retval; | |
572 | ||
573 | pcm->private_data = chip; | |
574 | pcm->info_flags = 0; | |
575 | strcpy(pcm->name, chip->card->shortname); | |
576 | chip->pcm = pcm; | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip) | |
582 | { | |
583 | struct snd_ac97_template template; | |
584 | memset(&template, 0, sizeof(template)); | |
585 | template.private_data = chip; | |
586 | return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97); | |
587 | } | |
588 | ||
589 | static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg, | |
590 | unsigned short val) | |
591 | { | |
592 | struct atmel_ac97c *chip = get_chip(ac97); | |
593 | unsigned long word; | |
594 | int timeout = 40; | |
595 | ||
596 | word = (reg & 0x7f) << 16 | val; | |
597 | ||
598 | do { | |
599 | if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) { | |
600 | ac97c_writel(chip, COTHR, word); | |
601 | return; | |
602 | } | |
603 | udelay(1); | |
604 | } while (--timeout); | |
605 | ||
606 | dev_dbg(&chip->pdev->dev, "codec write timeout\n"); | |
607 | } | |
608 | ||
609 | static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97, | |
610 | unsigned short reg) | |
611 | { | |
612 | struct atmel_ac97c *chip = get_chip(ac97); | |
613 | unsigned long word; | |
614 | int timeout = 40; | |
615 | int write = 10; | |
616 | ||
617 | word = (0x80 | (reg & 0x7f)) << 16; | |
618 | ||
619 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) | |
620 | ac97c_readl(chip, CORHR); | |
621 | ||
622 | retry_write: | |
623 | timeout = 40; | |
624 | ||
625 | do { | |
626 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) { | |
627 | ac97c_writel(chip, COTHR, word); | |
628 | goto read_reg; | |
629 | } | |
630 | udelay(10); | |
631 | } while (--timeout); | |
632 | ||
633 | if (!--write) | |
634 | goto timed_out; | |
635 | goto retry_write; | |
636 | ||
637 | read_reg: | |
638 | do { | |
639 | if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) { | |
640 | unsigned short val = ac97c_readl(chip, CORHR); | |
641 | return val; | |
642 | } | |
643 | udelay(10); | |
644 | } while (--timeout); | |
645 | ||
646 | if (!--write) | |
647 | goto timed_out; | |
648 | goto retry_write; | |
649 | ||
650 | timed_out: | |
651 | dev_dbg(&chip->pdev->dev, "codec read timeout\n"); | |
652 | return 0xffff; | |
653 | } | |
654 | ||
655 | static bool filter(struct dma_chan *chan, void *slave) | |
656 | { | |
657 | struct dw_dma_slave *dws = slave; | |
658 | ||
659 | if (dws->dma_dev == chan->device->dev) { | |
660 | chan->private = dws; | |
661 | return true; | |
662 | } else | |
663 | return false; | |
664 | } | |
665 | ||
666 | static void atmel_ac97c_reset(struct atmel_ac97c *chip) | |
667 | { | |
668 | ac97c_writel(chip, MR, AC97C_MR_WRST); | |
669 | ||
670 | if (gpio_is_valid(chip->reset_pin)) { | |
671 | gpio_set_value(chip->reset_pin, 0); | |
672 | /* AC97 v2.2 specifications says minimum 1 us. */ | |
673 | udelay(10); | |
674 | gpio_set_value(chip->reset_pin, 1); | |
675 | } | |
676 | ||
677 | udelay(1); | |
678 | ac97c_writel(chip, MR, AC97C_MR_ENA); | |
679 | } | |
680 | ||
681 | static int __devinit atmel_ac97c_probe(struct platform_device *pdev) | |
682 | { | |
683 | struct snd_card *card; | |
684 | struct atmel_ac97c *chip; | |
685 | struct resource *regs; | |
686 | struct ac97c_platform_data *pdata; | |
687 | struct clk *pclk; | |
688 | static struct snd_ac97_bus_ops ops = { | |
689 | .write = atmel_ac97c_write, | |
690 | .read = atmel_ac97c_read, | |
691 | }; | |
692 | int retval; | |
693 | ||
694 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
695 | if (!regs) { | |
696 | dev_dbg(&pdev->dev, "no memory resource\n"); | |
697 | return -ENXIO; | |
698 | } | |
699 | ||
700 | pdata = pdev->dev.platform_data; | |
701 | if (!pdata) { | |
702 | dev_dbg(&pdev->dev, "no platform data\n"); | |
703 | return -ENXIO; | |
704 | } | |
705 | ||
706 | pclk = clk_get(&pdev->dev, "pclk"); | |
707 | if (IS_ERR(pclk)) { | |
708 | dev_dbg(&pdev->dev, "no peripheral clock\n"); | |
709 | return PTR_ERR(pclk); | |
710 | } | |
711 | clk_enable(pclk); | |
712 | ||
713 | retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, | |
714 | THIS_MODULE, sizeof(struct atmel_ac97c), &card); | |
715 | if (retval) { | |
716 | dev_dbg(&pdev->dev, "could not create sound card device\n"); | |
717 | goto err_snd_card_new; | |
718 | } | |
719 | ||
720 | chip = get_chip(card); | |
721 | ||
722 | spin_lock_init(&chip->lock); | |
723 | ||
724 | strcpy(card->driver, "Atmel AC97C"); | |
725 | strcpy(card->shortname, "Atmel AC97C"); | |
726 | sprintf(card->longname, "Atmel AC97 controller"); | |
727 | ||
728 | chip->card = card; | |
729 | chip->pclk = pclk; | |
730 | chip->pdev = pdev; | |
731 | chip->regs = ioremap(regs->start, regs->end - regs->start + 1); | |
732 | ||
733 | if (!chip->regs) { | |
734 | dev_dbg(&pdev->dev, "could not remap register memory\n"); | |
735 | goto err_ioremap; | |
736 | } | |
737 | ||
738 | if (gpio_is_valid(pdata->reset_pin)) { | |
739 | if (gpio_request(pdata->reset_pin, "reset_pin")) { | |
740 | dev_dbg(&pdev->dev, "reset pin not available\n"); | |
741 | chip->reset_pin = -ENODEV; | |
742 | } else { | |
743 | gpio_direction_output(pdata->reset_pin, 1); | |
744 | chip->reset_pin = pdata->reset_pin; | |
745 | } | |
746 | } | |
747 | ||
748 | snd_card_set_dev(card, &pdev->dev); | |
749 | ||
750 | retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus); | |
751 | if (retval) { | |
752 | dev_dbg(&pdev->dev, "could not register on ac97 bus\n"); | |
753 | goto err_ac97_bus; | |
754 | } | |
755 | ||
756 | atmel_ac97c_reset(chip); | |
757 | ||
758 | retval = atmel_ac97c_mixer_new(chip); | |
759 | if (retval) { | |
760 | dev_dbg(&pdev->dev, "could not register ac97 mixer\n"); | |
761 | goto err_ac97_bus; | |
762 | } | |
763 | ||
764 | if (pdata->rx_dws.dma_dev) { | |
765 | struct dw_dma_slave *dws = &pdata->rx_dws; | |
766 | dma_cap_mask_t mask; | |
767 | ||
768 | dws->rx_reg = regs->start + AC97C_CARHR + 2; | |
769 | ||
770 | dma_cap_zero(mask); | |
771 | dma_cap_set(DMA_SLAVE, mask); | |
772 | ||
773 | chip->dma.rx_chan = dma_request_channel(mask, filter, dws); | |
774 | ||
775 | dev_info(&chip->pdev->dev, "using %s for DMA RX\n", | |
776 | chip->dma.rx_chan->dev->device.bus_id); | |
777 | set_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
778 | } | |
779 | ||
780 | if (pdata->tx_dws.dma_dev) { | |
781 | struct dw_dma_slave *dws = &pdata->tx_dws; | |
782 | dma_cap_mask_t mask; | |
783 | ||
784 | dws->tx_reg = regs->start + AC97C_CATHR + 2; | |
785 | ||
786 | dma_cap_zero(mask); | |
787 | dma_cap_set(DMA_SLAVE, mask); | |
788 | ||
789 | chip->dma.tx_chan = dma_request_channel(mask, filter, dws); | |
790 | ||
791 | dev_info(&chip->pdev->dev, "using %s for DMA TX\n", | |
792 | chip->dma.tx_chan->dev->device.bus_id); | |
793 | set_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
794 | } | |
795 | ||
796 | if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) && | |
797 | !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) { | |
798 | dev_dbg(&pdev->dev, "DMA not available\n"); | |
799 | retval = -ENODEV; | |
800 | goto err_dma; | |
801 | } | |
802 | ||
803 | retval = atmel_ac97c_pcm_new(chip); | |
804 | if (retval) { | |
805 | dev_dbg(&pdev->dev, "could not register ac97 pcm device\n"); | |
806 | goto err_dma; | |
807 | } | |
808 | ||
809 | retval = snd_card_register(card); | |
810 | if (retval) { | |
811 | dev_dbg(&pdev->dev, "could not register sound card\n"); | |
812 | goto err_ac97_bus; | |
813 | } | |
814 | ||
815 | platform_set_drvdata(pdev, card); | |
816 | ||
817 | dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p\n", | |
818 | chip->regs); | |
819 | ||
820 | return 0; | |
821 | ||
822 | err_dma: | |
823 | if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) | |
824 | dma_release_channel(chip->dma.rx_chan); | |
825 | if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) | |
826 | dma_release_channel(chip->dma.tx_chan); | |
827 | clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
828 | clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
829 | chip->dma.rx_chan = NULL; | |
830 | chip->dma.tx_chan = NULL; | |
831 | err_ac97_bus: | |
832 | snd_card_set_dev(card, NULL); | |
833 | ||
834 | if (gpio_is_valid(chip->reset_pin)) | |
835 | gpio_free(chip->reset_pin); | |
836 | ||
837 | iounmap(chip->regs); | |
838 | err_ioremap: | |
839 | snd_card_free(card); | |
840 | err_snd_card_new: | |
841 | clk_disable(pclk); | |
842 | clk_put(pclk); | |
843 | return retval; | |
844 | } | |
845 | ||
846 | #ifdef CONFIG_PM | |
847 | static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg) | |
848 | { | |
849 | struct snd_card *card = platform_get_drvdata(pdev); | |
850 | struct atmel_ac97c *chip = card->private_data; | |
851 | ||
852 | if (test_bit(DMA_RX_READY, &chip->flags)) | |
853 | dw_dma_cyclic_stop(chip->dma.rx_chan); | |
854 | if (test_bit(DMA_TX_READY, &chip->flags)) | |
855 | dw_dma_cyclic_stop(chip->dma.tx_chan); | |
856 | clk_disable(chip->pclk); | |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
861 | static int atmel_ac97c_resume(struct platform_device *pdev) | |
862 | { | |
863 | struct snd_card *card = platform_get_drvdata(pdev); | |
864 | struct atmel_ac97c *chip = card->private_data; | |
865 | ||
866 | clk_enable(chip->pclk); | |
867 | if (test_bit(DMA_RX_READY, &chip->flags)) | |
868 | dw_dma_cyclic_start(chip->dma.rx_chan); | |
869 | if (test_bit(DMA_TX_READY, &chip->flags)) | |
870 | dw_dma_cyclic_start(chip->dma.tx_chan); | |
871 | ||
872 | return 0; | |
873 | } | |
874 | #else | |
875 | #define atmel_ac97c_suspend NULL | |
876 | #define atmel_ac97c_resume NULL | |
877 | #endif | |
878 | ||
879 | static int __devexit atmel_ac97c_remove(struct platform_device *pdev) | |
880 | { | |
881 | struct snd_card *card = platform_get_drvdata(pdev); | |
882 | struct atmel_ac97c *chip = get_chip(card); | |
883 | ||
884 | if (gpio_is_valid(chip->reset_pin)) | |
885 | gpio_free(chip->reset_pin); | |
886 | ||
887 | clk_disable(chip->pclk); | |
888 | clk_put(chip->pclk); | |
889 | iounmap(chip->regs); | |
890 | ||
891 | if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags)) | |
892 | dma_release_channel(chip->dma.rx_chan); | |
893 | if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) | |
894 | dma_release_channel(chip->dma.tx_chan); | |
895 | clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags); | |
896 | clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags); | |
897 | chip->dma.rx_chan = NULL; | |
898 | chip->dma.tx_chan = NULL; | |
899 | ||
900 | snd_card_set_dev(card, NULL); | |
901 | snd_card_free(card); | |
902 | ||
903 | platform_set_drvdata(pdev, NULL); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | static struct platform_driver atmel_ac97c_driver = { | |
909 | .remove = __devexit_p(atmel_ac97c_remove), | |
910 | .driver = { | |
911 | .name = "atmel_ac97c", | |
912 | }, | |
913 | .suspend = atmel_ac97c_suspend, | |
914 | .resume = atmel_ac97c_resume, | |
915 | }; | |
916 | ||
917 | static int __init atmel_ac97c_init(void) | |
918 | { | |
919 | return platform_driver_probe(&atmel_ac97c_driver, | |
920 | atmel_ac97c_probe); | |
921 | } | |
922 | module_init(atmel_ac97c_init); | |
923 | ||
924 | static void __exit atmel_ac97c_exit(void) | |
925 | { | |
926 | platform_driver_unregister(&atmel_ac97c_driver); | |
927 | } | |
928 | module_exit(atmel_ac97c_exit); | |
929 | ||
930 | MODULE_LICENSE("GPL"); | |
931 | MODULE_DESCRIPTION("Driver for Atmel AC97 controller"); | |
932 | MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>"); |